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Cisco Networking Simplified by Jim Doherty, Paul Della Maggiora

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Chapter . QoS

QoS: Frequent Flyers and Air-Traffic Controllers

Quality of service (QoS) is the enabler of the Internet Protocol (IP) network convergence trend. The fundamental concept that enables IP network convergence is the conversion or tunneling of other network technologies into Transmission Control Protocol/Internet Protocol (TCP/IP) across traditional data networks. With voice, it’s the conversion of traditional time-division multiplexing (TDM) voice streams into packetized voice packets. IP networks are built on shared bandwidth. Thus IP networks must have mechanisms that “simulate” the dedicated on-time delivery associated with traditional voice and video networks.

Moving voice, video, and other time-sensitive technologies onto traditional ...

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